Ted Ringwood - Misplaced Pages

(Redirected from Alfred E. Ringwood) Australian geophysicist/chemist (1930–1993)

Alfred Edward "Ted" Ringwood
Born	(1930-04-19)19 April 1930 Kew, Melbourne, Australia
Died	12 November 1993(1993-11-12) (aged 63)
Alma mater	Melbourne University
Awards	Clarke Medal (1992) V. M. Goldschmidt Award (1991) Wollaston Medal (1988) William Bowie Medal (1974)
Scientific career
Fields	Geochemistry, petrology, planetology
Institutions	Australian National University
Thesis	Studies in geochemistry (1956)
Academic advisors	Arthur Gaskin, Francis Birch

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Alfred Edward "Ted" Ringwood FRS FAA (19 April 1930 – 12 November 1993) was an Australian experimental geophysicist and geochemist, and the 1988 recipient of the Wollaston Medal.

The mineral ringwoodite is named after him.

Early life and study

Ringwood was born in Kew, only child of Alfred Edward Ringwood. He attended Hawthorn West State School where he played cricket and Australian Rules football. In 1943 he was successful in gaining a scholarship to Geelong Grammar School where he boarded. On matriculation, he enrolled in Geology a science degree at the University of Melbourne where he held a Commonwealth Government Scholarship, and was awarded a resident scholarship at Trinity College. He represented the college and the university in football. He obtained First Class Honours degree in Geology and began a MSc degree in field-mapping and petrology of the Devonian Snowy River volcanics of northeastern Victoria, graduating with Honours in 1953. Ringwood then undertook a PhD, beginning an experimental study about the origin of metalliferous ore deposits, but later changed his research topic so as to apply geochemistry to an understanding of the structure of the Earth, in particular the mineralogical constitution of the Earth's mantle.

Germanate and Earth's mantle

In the late 1950s and 1960s Ringwood worked on germanates. He discovered that they served as low-pressure analogue to high-pressure silicates. With this insight he was able to predict that the phase changes of the mantle minerals olivine and pyroxene should occur in the Transition Zone. At the Australian National University he began experimental study of silicates at high pressure, and in 1959 demonstrated that the iron end-member of olivine indeed transformed to the denser spinel structure, as did numerous germanate and germanate-silicate solid solutions. In 1966, Ringwood and Alan Major, the technical officer who worked with him from 1964 to 1993, synthesised the spinel form of (Mg,Fe)₂SiO₄, Also in 1966, the transformation of pure forsterite (Mg₂SiO₄) to spinel-like phase was achieved.

In 1969 a new mineral was discovered in fragments of the Tenham meteorite which had the same crystal structure as the high pressure spinel polymorph of olivine. This was the first time that Ringwood's predicted polymorph was found in nature. Honouring the importance of Ringwood's work the mineral was named ringwoodite. A team from the University of Alberta have isolated terrestrial ringwoodite in a brown diamond specimen found in Brazil in 2008. Their research suggests the presence of water deep within the Earth's mantle.

Later life

In 1978, his ANU team invented synroc, a possible means of safely storing and disposing of radioactive waste.

Ringwood died of lymphoma on 12 November 1993 at the age of 63.

Honours

Ringwood received numerous honours and awards for his work.

Fellowships

1966 Fellow of the Australian Academy of Science (FAA)
1969 Fellow, American Geophysical Union
1972 Fellow of the Royal Society of London (FRS)
1972 Fellow, Meteoritical Society
1983 Honorary Foreign Fellow, European Union of Geosciences

The European Association of Geochemistry quinquennially awards a Science Innovation Award medal named in his honour for work in petrology and mineral physics.

Selected publications

Ringwood, A. E. (1979). Origin of the earth and moon. New York: Springer-Verlag. ISBN 978-0387903699.
Ringwood, A. E. (1976). Composition and petrology of the earth's mantle. New York: McGraw-Hill. ISBN 9780070529328.

References

^ D.H. Green (1998). "Alfred Edward Ringwood 1930–1993". Historical Records of Australian Science. 12 (2): 247. doi:10.1071/HR9981220247. Retrieved 20 December 2012.
Green, D. H. (1998). "Alfred Edward Ringwood. 19 April 1930 – 12 November 1993". Biographical Memoirs of Fellows of the Royal Society. 44: 351–362. doi:10.1098/rsbm.1998.0023. S2CID 58754781.
"Wollaston Medal". Award Winners since 1831. Geological Society of London. Archived from the original on 19 August 2010. Retrieved 25 February 2009.
Binns, Ray A.; Davis, Richard J.; Reed, Stephen J. B. (7 March 1969). "Ringwoodite, Natural (Mg,Fe)₂SiO₄ Spinel in the Tenham Meteorite". Nature. 221 (5184): 943–944. Bibcode:1969Natur.221..943B. doi:10.1038/221943a0. S2CID 4207095.
Pearson, D. G.; Brenker, F. E.; Nestola, F.; McNeill, J.; Nasdala, L.; Hutchison, M. T.; Matveev, S.; Mather, K.; Silversmit, G.; Schmitz, S.; Vekemans, B.; Vincze, L. (13 March 2014). "Hydrous mantle transition zone indicated by ringwoodite included within diamond" (PDF). Nature. 507 (7491): 221–224. Bibcode:2014Natur.507..221P. doi:10.1038/nature13080. PMID 24622201. S2CID 205237822.
Abraham Gottlob Werner Medaille, Deutsche Mineralogische Gesellschaft